Stop-motion.



M. C. RYAN.

STOP MOTION.

APPLICATION FILED 11:12.16, 1910. 1,004,594.

Patented Oct. 3, 911.

a sIIIIIzTs-snlz'r 1.

ggtllllllllllllllllllllv fm I M. O. RYAN.

STOP MOTION.

APPLIoATIoN funn 21:15.16, 1910.

1,004,594. Patented Oct. 3, 1911.

M om] lu u e nto/L 1 Q a Houle M. C. RYAN. STOP MOTION. APPLIOATIONFILED FEB. 1e, 1910.

Patented Oct. 3, 1911.

3 SHEETS-SHEET 3.

MICHAEL C. RYAN, OIF PHOENIX,'NEW YORK.

STOP-MOTION.

Specication of Letters Patent.

Patented oct. 3, 1911.

Application led February 16, 1910. Serial No. 544,281.

To all whom it may concern:

Be it known that I, MICHAEL C. RYAN, a citizen of the United States,residing at Phoenix, Oswego county, New York, have invented certain newand useful Improvements in Stop-Motions; and I do hereby declare thefollowing to be a full, clear, andV exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same.

This invention relates to certain improvements in stop motions for silkdoubling and winding machines and the like and the objects and nature ofthe invention will be readily understood by those skilled in the art inthe light of the following description of the accompanying drawingsshowing what I now consider my preferred embodimentu from among otherconstructions and arrangements within the spirit and scope of myinvention.

An object of the invention is to providel kcertain improvements in stopmotions for doubling, winding and other machines of similar characterand purpose, and whereby when a thread or strand breaks the windingbobbin or reel will be almost instantaneously stopped and locked orgripped against continued rotation thereby preventing continued:rotation of the bobbin after it has been thrown from operativeposition,4 or relation with respect to its driving means.

A further object of the invention is to provide certain improvements inarrangements and combinations whereby a simple and highly elicientstopmotion will be produced, readily adaptable to doubling and other silk orthread machines.

The invention consists in certain novelfeatures in constructions andarrangements of parts. and in combinations and arrangements of elementsas more fully and particularly set forth hereinafter. f

' Referring to the accompanying drawings z-Figure 1, is a detail frontperspective viewof a stop motion embodying my invention, the parts beingshown in normal operative positionya winding `bobbin and the silkstrands thereto being shown. Fig.

2, is a detail end elevation, of the structure v shown in Fig. 1, theparts being shown in normal operative position, the winding bobbin beingshown incross section, the cover or side wall of the case containing thetrip mechanism being removed. Fig. 3, is a.

view similar to Fig. 2, but showing one silk strand broken and the partsin bobbin stopping position. Fig. 4, is a detail front elevation of thestop-motion-carrying arm (the bobbin being partially shown in section)with the parts inthe position shown by Fig. 3. Fig. 5, is a horizontalsection on the line 5-5, Fig. 2. Fi 6, is a detail perspective of thebobbin li ing finger and its operating finger piece, and the electricswitch controlled thereby. Fig. 7, is a detail perspective view ofdetails of the trip l mechanism.

My stop motion is particularly designed for detecting Abreaks in thestrands passing from the supply bobbins to the winding bobbins of silkdoubling machines although it is adapted for application to winding,reeling and other silk and thread handling machinery.

In the example shown, in is a winding bobbin having end trunnions 3,which can be formed by' a spindle or shaft. The bobbin is also providedwith a friction drum or hub 4. The.bobbin is driven by a constantlyrotating'friction disk 5, carried by drive shaft 6. The bobbin trunnionsrest removably in the vertical slot bearings 7, so that the bobbin isvertically removable from the machine and rests by gravity on thefricthe drawings, 2,

tion driving disk and is rotated by the fricwith, and have notillustrated the structure of the doubling machine inasmuch as those`skilled in the art are familiar withwsuch machines and will readily'understand the application of my invention thereto.

lv show the stop motion carried by a suitable bracket at its lower endbolted or otherwise secured to a suitable longitudinal beam of themachine frame, and rising therefrom in the form of an arm 10,terminating below the winding bobbin, and comprising a vided for eachstrand 14, passing to the bobbin. Each detector can consist of avertically movable spring met-al wire at its outer free end having theeye 13, and at its inner end formed into a coil 15, confined androckable on a metal supporting rod or vrod 1"9. This operation shaft 16,and having a rear upwardly projecting stop or contact end 17 to limitthe downward movement of the free end of the detector, while the upwardmovement of the detectors mounted .on horizontal rod 16, is limitedbythe back turned horizontal outer end 18, of said shaft, said stop end18, being arranged above the detector arms to beengaged thereby. Thedownward movement of the free ends of the independent detector arms islimited by the upward engagement of their projecting rear ends 17, withthe horizontal metal rod-19, parallel with and above `metal rod or shaft16. The constant tendency of the detector arms is to assume the loweredpositions with their rear ends 17,

in contact with the stop rod 19. The silk strands passing up through theeyes 13, of the detectors to the winding bobbin, hold said detectorsswung upwardly against the stop arm 18 with their contact ends 17, awayfrom stop rod 19, by reason of the fact that said strands are stretchedor under tension. Should either strand part or break, the tension on itsdetectorarm will be immediately relieved and said arm will instantlydrop untilv its contact end 17engages `the stop or action is takenadvantage of through the medium of electric devices to bring about theaction of `the stop motion `to practically stop and lock the wind-A 1ngbobbin almost"instantaneously with the breaking of anyY strand passingto said bobbin. c

`The stop rod 19, and shaft-16, are insulated from each other in yandare carried by an insulating block '20, fixed on the front portlon ofthe stop motion supporting "bracket The electricalconducting rod 19 andshaft 16, are shown passing completely through fsaid block andprojecting laterally 5 therefrom and'at their short threaded projectingends opposite the detectors are provided with nuts 21, independentlyclamping the rod and shaft to the block and forming bindlng posts forthe electrical connection of conductors 22, 23. The shaft 16,'ispreferably axially movable or turnable in the block for the purposeofadjusting the stop end. 18, up or down to vary the upward l1m1t oftheswing of the detectors for .the purpose of increasingor diminishing thetension on the silk strands passing through the eyes. thereof. The shaftis clamped in the desired axial adjustment by tightening the nut of thebinding post 21, thereof.

The conductor 22, extends from any suitable source of electrical energyand the shaft 16, and conducting-wire detectors' thereon are constantlyin circuit therewith and the circuit therefrom to the conducting andstop rod 19, is normally broken because of the normal separation of thedetectors from the rod 19.

The conductor 23, extends from the'binding post 21, (electricallyconnecting rod 19 and said conductor) to normally dead electro-magnet ormotor 24, and electrically connects the same with rod 19. The magnet 24,is arranged in the box or casing,

hereinbefore mentioned, and is insulated from the walls thereof andconstitutes the releasing device for the trip mechanism normally holdingthe binding bobbin grip or lock out of action. v

The binding bobbin stop and locking or gripping device comprises a pairof upwardly projecting oppositely arranged cooperating aws 25, 26,having concaved faces which if so desired can be provided with frictiongripping faces 27, formed by leather or other suitable friction orcushioning material secured thereto. These jaws are approximately alike`in formation and each is formed with a depending shank or lever 28,rigid with its jaw. The two Shanks are crossed and at the point ofintersection are pivotally jointed together to form a fixed fulcrumpoint. This fulcrum is formed by a pin or stud 29, projecting laterallyfrom the upper portion of the stop motion bracket arm, and supportingthe bobbin gripping jaws. The lower ends of the two levers formed by thejaws and their shanks 28, are pivotally joined respectively, to theunder ends of a pair of links 29", which at their lower ends arepivotally joined to the upper end of a vertically movable slide 30,passing vertically through said box or casing and :guided thereby in itsvertical reciprocation. The toggle or lazy-tong arrangement thusprovided, is such that when the slide 30, moves upwardly the grippingjaws will be swung apart to non-gripping or inoperative position, butwhen the slide moves down said jaws will ^be moved toward each other togripping position.

eans are provided, preferably constantly acting, to throw the slidedowny wardly to move .the jaws to gripping po-l sition with sufficientforce to perform their locklng or stopping function. As a meanswhich canbe conveniently employed for this purpose, I` show an expansive coiledspring 31, on the slide and within thebox andcompressed between the topwall of the v I box and 'a loose or slidable collar v32, on the i allyprojecting tooth or upwardly facing shoulder 39, arranged a distanceabove the -mounted in the slide.

slide. Means are also provided for normally holding the slide elevatedagainst the tension of said spring to hold the jaws in their normalinoperative positions, said means comprising a trip whereby the slidecan be quickly released to permitJ its spring to act in forcing the samedown to bring the jaws to gripping position should a thread or strandbreak. As an example of means which can be employed for this purpose. Ishow a vertically disposed elongated flat dog 33, arrangedlongitudinally of the slide in a longit-udinal slot cut therethrough.This dog is carried by and projects beyond the slide and is mounted torock on a transverse pin 34, arranged near the upper end thereof and oywhich the dog is carried and The transverse fiat upper end of the dog isarranged beneath the loose collar 31, and forms the stop limitingdownward movement of the-collar, and

j the formation of said upper end of the dog is such-that the'pressureof the spring 31,y

thereon through the collar, yieldingly holds v thefdog in its normalupright position so that the dog can swing to move its lower end'laterally only by slightly raising said collar against the tension ofsaid spring.

The lower end of the dog is formed with a laterally projecting tooth ordownwardly facing shoulder 35. The trip for engaging the tooth 35l ofsaid dog to normally hold the slide-and gripping jaws in set orinoperative position comprises a vertically rocking trigger, catch'orlever mounted to rock on a fixed transverse shaft or pin 36, andcomprisingan elongated lupwardly extending arm 37,having a tooth orshoulder 38, at its upper extremity and at its lower end mounted on saidpin 36, and having a laterfloor of said casing or box and normally inthe path of movement of the dog tooth 35.. The arrangement is 'such thatwhen the slide isin'its normal set or elevated position,

the tooth 35, of it-s dog will rest and bear down onthe shoulder 39, ofsaid lever or ,tripandwill' thereby be upheld while the 'ppingjaw-throwing spring tends to swlng said lever or trip to remove shoulder35, from Ithe path of the dog and to swing than perend'of the arm 37inwardly and latera ly away from the vertical wall of the box (againstwhich the upper end of the arm normally vvrests. The said trip isnormally held and maintained in its locking `or slideupholding positionby` the extended or stop le1'1d4=0,".of vthe vertical-ly swinginghorizont-allyarranged r'lriagnety armature 41, fulycrumed or pivotally`mounted between its ends in said box on horizontal or transverse lfixedpin ,42.* The stop end 40', of the armature,- normally bears down on thetop edge v11 the` ytrip im: 37, with' the shoulder 38 of said armbearing inwardly against the end edge of said stop end which thus holdsthe trip arm in its normal position and against inward swing andupholding the trip shoulder 39 in its elevated position sustaining theslide.

When the magnet is energized its armature is drawn down therebylift-ingvits stop end from holding engagement with the trip armshoulder,whereupon the gripping-jawthrowing spring will rock the trip torelease the dog therefrom and permit downward movement of the slide. Thedownward movement of the slide is limited by the engagement of the lowerend of the dog with the floor of the box or casing, thereby limiting theclosing movement of the gripping jaws. ,The limit of the closingmovement of said jaws can be varied by raising or lowering the pivot ofthe dog in the slide. v

The instant the dog is released from the trip, the trip is returned toits normal operative position by a spring 43, applied thereto and alsoto the armature to normally-hold the same from the magnet and its stopend i to the trip arm. The trip is swung by spring 43 to its normalposition and the armature stop end immediately moves down on the triparm and holds the same in operativel set position.y When the grippingjaws are swung open or restored to their normal set position',` by hand,and against the tension of the jaw-throwing spring, the slide is drawnup and during this operation, the slide dog, which had been swunglaterally on its downward movement, bears against the edge ofthe trip,and when the tooth of the dog moves up past the shoulder of the trip,the dog immediately swings to its normal upright 4position with itstooth resting on the trip shoulder and thereby holding the parts in setposition with the jaws open The gripping jaws .are arranged below and infront and rear of the friction hub of the winding bobbin and when setorin their, normal positions are disengaged therefrom so as not tointerfere with the free rotation of the bobbin. When, however,

.a strand passing to said bobbin breaks, the

magnet is 'immediately energized and the jaws are released and tightlygrip said hub of the bobbin and lift the bobbin to raise said hubthereof from driven contact with the friction driving disk. The actionof the. jaws is so rapid that the jaws on the parting of a strand almostinstantlyvgrip the tion/of tying the broken strand is completed andbeforethe bobbin is dropped into frictional driving engagement with itsdriving disk, and as it is necessary to open the gripf ping jaws. beforet-he bobbinv can be thus turned by hand, -I provide means for holdingthe bobbinlifted from its driving disk after the gripping jaws have beenopened and removed from grippingengagement with the bobbin. For*example, I show one of the grippingjaws provided with a lifting finger44, arrangedto one` sideof the jaw and beyond the end of the bobbin andprojecting downwardly and inwardly in the vertical plane of the endtrunnion of the bobbin. This finger is mounted to swing vertically underfriction on a transverse shaft in the upper end of the jaw and isprovided with an upwardly projecting Afinger piece 45, whereby thefinger can be lmoved to-and from normal and lifting ,-or supportingpositions. The linger is normally swung down from operative positionwith respect to the bobbin trunnion, but when a thread has broken andthe jaws have gripped the bobbin, the linger piece 45, lis then swunglaterally and the lifting finger thereby swung up into liftingengagement with the trunnion-of the bobbin gripped and elevated by thejaws. The jaws can then be opened to "setposition A releasing thebobbin, and the lifting finger will prevent the bobbin dropping intodriv engagement with the friction disk. While t-hus held by the fingerthe bobbin can be freely rotated by hand. When the broken 4thread hasbeen tied and the operator desires to again start the bobbin on itswinding operation, the finger piece is swung forward and the finger isvthereby lowered droppingthe bobbin'onto its driving'disk.

, The electric circuit for energizing the trip operating ma etiscontrolled by any one of vthe hereinbefore mentioned detector arms andis' normally broken because of theseparation of the detector arms -17(forming one contact f the circuit closer or switch) from the Conductingstop rod 19 (forming the ether ,end stationary contact-oftheswitch binhas again started to wind and has thus restored the tension vto thestrand. necessary to lift the detector andbre'ak the circuit.

Suchbeing the state of facts, in the specific Aexample illustrated, .itis obvious that.

if the ljaws are opened to hold the bobbin V`up by the lifting finger,as hereinbeforelescribed, the magnet A. would 'again immediately releasethe trip) and cause closing of the jaws, unless ,some means are providedclosed switch in circuit with the magnet and adapted tobe opened by theclosing of the gripping jaws. To this end I provide 'a knife switchcomprising a. depending knife contact 47, carried by one of the jaws'andin circuit closing` in circuit therewith and usually through the j sameto the stopy mot-ion supporting bracket which can be electricallyconnected withA the return to the source of electrical energy. I

\show.,this knife contactlcarried by thefinger piece 45, to swingtherewith and with the bobbin lifting finger. 4The stationary member orcontact 48of the knife switch is fixed to the upper end of the arm ofthe stop motion supporting bracket and is suit-ably insulated therefrombut is electrically vcon nected with the magnet coil'by connection 49,so as to be in circuit with said coil. The arrangement of the switchcontacts is such that, when the jaws are in their normal set positionand the lifting finger is in its normal depressed position, saidcontacts will be in engagement and the switch closed to complete thecircuit from the magnet coils to t e met-al supporting frame of thestopv motion. When the jaws move to bobbinf gripping-and-liftingposition, the knife switch is opened inasmuch as the jaw carrying theknife member of the switch moves the same from contact with the fixedmemberl of the switch, and the circuit is thereby broken and the magnetvdenerg'ized even though the detector be in circuit-closing position.AThe knife switch still remains open and the circuit broken when the jawsare again thrown back to set position inas- 4much as the movement of thelifting finger to bobbin-lifting position throws the knife member of theswitch forward from po-sition where it willengage the fixed 4switch mem--ber when the jaws are opened. The magnet will thus remain denergizeduntil the bobbin vis ready to start its winding operation and has beenrestored to winding posi- -tion by the lowering of the lifting finger,which action throws the .knife member offthe switch into circuit closingengagement with the fixed lmember thereof, but before this switch isthus closed,the circuit has been broken by the lifting of the detectorarm or arms.- i v j As.v at present advised, I do not wish to limit allfeatures ,of myy invention to any particular' ,trip mechanism .andreleasing means therefor nor to the electrical devices controlled bythebreaking of a thread, inasmuch as other means migh `be employed forcontrolling my gripping 'aws, and furthermo-re'I do. not wish to limitcertain other v features of my invention to the particular bobbinstopping means described, and it is evident that various changes andmodifications might be resorted'to in the forms, conthe desiredadjustment, a swingable detector arm having a thread eye at its freeend, said arm being mounted to swing on said shaft, means to limit themovement of the arm in one direction, and a stop portion carried by saidshaft to limit the swing of the arm in the opposite direction, theposition of said sto portion with respect to the arm being adjustable byrocking the shaft.

2. In a "stop motion, a rockable shaft,

` means for securing the same in a. desired axial adjustment, a.swingable detector arm mounted to rock onsaid shaft and having a threadeye, said shaft having a. back-turned end above said arm forming a stopto limit the upward movement of the arms, a stop rod, said arm having arear projected end to engage said stop rod to limit the downwardmovement lof the arm.

3. In a stop motion, a support, a block of insulating material thereon,a conducting contact rod projecting from and carried by said block andprovided with means for connecting an'electric conductor thereto, arotatably adjustable conductin shaft mounted in said lblock andprojecting t erefrom parallel with said rod and having means forcoupling an electric conductor therewith,I and a detector arm ofconducting material mounted to swin on said shaft, and having a threadeye an a rearwardly projecting stop end normally out of contact withsald rod and ada ted to move into contact with the rod to limit thedownward movement of the arm, said shaft provided with a stop armadjustable therewith to limit the swing of said detector arm.

4. In a sto motion, a vertically movable tension and Idetector armhaving a thread eye and an electric-contact and stop end, a support onwhich said arm is fulcrumed, an adjustable arm-engaging stop carried byand moving with said support and limiting upward movement of sald armand determining the tension thereof on the thread, and a stationaryelectric-contact stop adapted to be electrically engaged by said endwhen the detector drops from normal position.

5. In a stop motion, a spring conductingmaterial tension and detectorarm` at its vertically movable free end having a thread eye, aconducting shaft on which said arm is mounted to swin a stationarycontact, said arm formed wit a coil rockable on said shaft andterminatingY in a free contact end normally out of contact with saidstationary contact and adapted to engage the same when the arm drops tonormal position, and a stop limiting upwardswing of the thread eye.

end of said arm and formed by a bent-back end of said shaft.

6. In a stop motion, in combination, stop `mechanism, electriccontrolling means therefor comprising an electric motor, a support, anda normal open switch controlling said motor and com rising anaxially-adjustable conducting sha t providedwith and carrying adetector-arm stop, swingable detector arms of conducting material formedwith intermediate bearing eyes rockable onsaid shaft and having threadeyes and movableA contact portions extending radially therefrom, and aconductingl rod parallel with said shaft and forming t e statlonaryswitch contact and adapted to be engaged by the contacting portion ofany detector arm when the same drops from normal position.

7. A stop motion, comprismg a supporting bracket, circuit closingdetector arms carried thereby, a pair of coperating bobbin grippingdevices mounted thereon, operating and controlling means for saiddev1ces carried by said bracket andcomprising an electric motor incircuit with said detector arms.

8. A sto motion comprising coperating ybobbin liftmg and clampinglevers, in com bination with actuating means, and control- ,ling devicescomprising a thread receiving detector arm, and an electric motor incircuit therewith.

9. A stop motion comprising winding-bobbin gras ing and elevating jaws,in combina- -tion wit means for actuating the same on their operativemovements, means normally holding said jaws in set position, and a tripdevice.

10. A stop motion comprising coperating bobbin clam ing and liftingjaws, actuating means there or, and controlling devices for saidactuating means.

11. A stop motion comprising a pair of pivoted opposing coperatingclamping jaws, means for holding said jaws set in inoperative position,controlling devices for said means, and jaw actuating mechanisms.

12. A stop motion comprising a pair of cooperating clamping jawsprovided with means for simultaneously moving the same in oppositedirections, a trip mechanism for holding said jaws set, and devices foractuating said trip.

13. A stop motion comprising a pair of cooperating pivoted bobbinclamping jaws, in combination with a spring and connections forsimultaneously movin said 'aws to clamping position, means or holdlngsaid jaws in opened or set position, and mechanism controlled by thebreaking of a thread for operating said means to release said jaws formovement to clamping position.

14. Astop motion comprising bobbin lifting and clamping jaws, jawoperating means, and an independently movable bobbin lifting devicecarried by one of said jaws.

15. A stop motion provided with a pair of coperating bobbin clampingjaws, jaw operating means, and a pivoted bobbin lifting finger carriedby one of said jaws.

16. In a stop motion, in combination, bobbin clamping means, actuatingdevices therefor, and independently movable lifting means carriedthereby.

17. A stop motion comprising a pair of cooperating bobbin clamping jaws,means for simultaneously moving said aws in opposite directions,controlling mechanism therefor, and a vertically movable manuallyoperated bobbin lifting finger carried by one of said jaws and movableindependently thereof.

18. A stop motion comprising in combination, a supporting bracket, apair of cooperating bobbin clamping jaws extending upwardly therefromand pivoted thereto, a spring actuated slide coupled to said jaws tosimultaneously move the same in opposite directions, trip mechanism forholding said slide and the jaws in set position, and a releasing devicefor said trip mechanism comprising a broken thread detector.

19. A sto motion comprising in combination, oppositely-movablecoperating bobbin lifting and clamping jaws, a spring deviceforactuating said jaws to clamp the bobbin agai/nst rotation, a tripmechanism for norv mally holding said means in set inoperative positionagainst the tension of said spring, and releasing means for said tripmechanism comprising a movable thread receivingdetector. s

20. In combination, in a stop motion, a bracket comprising a box and anupwardly extending arm, bobbin gripping jaws fulcrumed to said arm, aspring actuated slide movable through said box and pivotally joined tosaid jaws to simultaneously swing the same in opposite directions, atrip mechanism in said box to normally l hold said slider set againstthe tension of said spring, 'an electric motor in said box 'forreleasing said trip mechanism, and a movable thread receiving detectorarm carried by said'bracket and controlling the motor actuating circuit.

21. In a stop motion, in combination, winding member stopping means, anelec- .trioI switch controlled by the movement thereof and comprising.Yan independently movable manually operative contact member, actuatingmechanism for said means, a trip mechanism therefor, and a releasingdevice for said trip mechanism comprising an electric motor in circuitwith said switch and a thread receiving detector arm circuit closer incircuit with said motor.

22. A stop moti-on comprising winding member gripping jaws, means forsimul-v aws, and a movable contact carried by and moving with one ofsaid jaws.

23. A stop motion comprising oppositely movable pivoted winding-memberclamping jaws, a manually operated member lifting finger carried by oneof said jaws and manuallymovable independently thereof land providedwith a switch contact movable therewith, anda stationary coperatingcontact fixed with respect rto said jaws.

24. In a stop motion, in combination, winding member sto-p means, aspring actuated slide for operating the same, a spring actuated,laterally swingable dog carried thereby, a swingable trip therefor forholding said slide in set position against the tension of its spring andcomprising a laterally swingable arm provided with a shoulder forengaging said dog for holding the slide set, and means for releasingsaid arm to permit disengagement of its shoulder from said dog.

25. In a stop motion, in combination, winding member stop means, a slidefor actuating the same, an actuating spring on the slide for moving thesame in one direction, a laterally swingable dog pivoted to lthe slideand held in normal position longitudinally ofthe slide by said spring, atrip to engage said dog to hold the slide set against the tension ofsaid spring and releasing means for the trip.

26. In a stop motion, in combination, a slide, stop means actuatedthereby, guides for said slide, a spring acting on said slide to forcethe same on its operative stroke, a dog arranged longitudinally of saidslide and fulcrumed thereto to swing laterally thereof, said springacting onsaid dog to yieldingly hold the same in normal operativeposition with respect to said slide, said dog projecting laterallybeyond the slide to engage a guide and limit the movement of the slidein lone direction, a trip device arranged adjacent to said slide andhaving a shoulder to engage said dog and hold the slide set against thetension of the spring, and means for releasing said trip device topermit reciprocation of the slide.

27. a stop motion, a box, an actuating slide movable therethrough, a dogpivoted thereto to swing laterally thereof and projecting laterallytherefrom, aloose collar on said slide and resting on said dog, aslideengage' said dog and hold the slide set against the tension of itsspring, a rockable trip lever to engage said arm and normally hold thesame against rocking in a direction to release said dog, and means for,actuating said trip lever to release said arm.

28. In a stop motion a pair of crossed pivoted levers at their free endsformed with opposing bobbin lifting and clamping jaws, actuating meansconnected to said levers and constantly tending to swing the same tobobbin gripping position, means normally holding said levers ininoperative or set po sition, and a trip mechanism for releasing saidholding means.

In testimon whereof I affix my signature, in presence o two witnesses.

MICHAEL C. RYAN.

,Witnessesz FRANK J. Loomis, CHARLES F. Loomis.

